What's the significance behind the title of "tree 63?"?

Question

Tree 63 is a Christian band from South Africa.

Answer 1

Initially, the name of the band, was simply Tree (John Ellis' idea after standing under one). They added the 63 in 2000 due to a naming conflict with an American band. 63 had been the name of their second album, which was named in reference to Psalm 63.